Daoshi are priests. In other words another group of Shaman. By putting a charm with words of their blood to the forehead of a Kyonshi Daoshis are able to control them by mere commands.
Hyoi Gattei is the technique when the spirit enters into the body of a Shaman.
Kyonshi is the dead body of a specific spirit. So they are visible for ordinary humans. The owner's dead soul of the body will be transferred into it.
Mitakos are Shamans who are able to call spirits from the dead world.
Oversoul is the technique for a spirit to enter an obeject like a sword or something else.
Shamans are humans who severes as link to the living world and the dead world.
Spirit Ball is a modus of a spirit if a Shaman use him/her.